Contract Source Code (Vyper language format)

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# @version 0.3.7
"""
@title Crypto Swap Burner
@notice Performs a swap using a Crypto pool, with slippage protection via price oracle
"""

interface ERC20:
    def transferFrom(_from: address, _to: address, _value: uint256) -> bool: nonpayable
    def balanceOf(_owner: address) -> uint256: view
    def decimals() -> uint256: view

interface CryptoPool:
    def exchange(i: uint256, j: uint256, dx: uint256, min_dy: uint256): payable
    def price_oracle() -> uint256: view

interface TricryptoPool:
    def price_oracle(_i: uint256) -> uint256: view

interface CryptoPoolETH:
    def exchange(i: uint256, j: uint256, dx: uint256, min_dy: uint256, use_eth: bool): payable

interface PoolProxy:
    def burners(_coin: address) -> address: view


struct SwapData:
    pool: address
    coin: address
    receiver: address
    i: uint256
    j: uint256
    is_tricrypto: bool


ETH_ADDRESS: constant(address) = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE

is_approved: HashMap[address, HashMap[address, bool]]
swap_data: public(HashMap[address, SwapData])
pool_proxy: public(address)
recovery: public(address)
is_killed: public(bool)

owner: public(address)
emergency_owner: public(address)
future_owner: public(address)
future_emergency_owner: public(address)


@external
def __init__(_pool_proxy: address, _recovery: address, _owner: address, _emergency_owner: address):
    """
    @notice Contract constructor
    @dev Unlike other burners, this contract may transfer tokens to
         multiple addresses after the swap. Receiver addresses are
         set by calling `set_swap_data` instead of setting it
         within the constructor.
    @param _recovery Address that tokens are transferred to during an
                     emergency token recovery.
    @param _owner Owner address. Can kill the contract, recover tokens
                  and modify the recovery address.
    @param _emergency_owner Emergency owner address. Can kill the contract
                            and recover tokens.
    """
    self.pool_proxy = _pool_proxy
    self.recovery = _recovery
    self.owner = _owner
    self.emergency_owner = _emergency_owner


@payable
@external
def __default__():
    # required to receive ether during intermediate swaps
    pass


@internal
def _transfer_from(_coin: address, _from: address) -> (uint256, uint256):
    if _coin == ETH_ADDRESS:
        return self.balance, self.balance

    # transfer coins from caller
    amount: uint256 = ERC20(_coin).balanceOf(_from)
    if amount != 0:
        response: Bytes[32] = raw_call(
            _coin,
            _abi_encode(
                self.pool_proxy,
                self,
                amount,
                method_id=method_id("transferFrom(address,address,uint256)")
            ),
            max_outsize=32,
        )
        if len(response) != 0:
            assert convert(response, bool)

    # get actual balance in case of transfer fee or pre-existing balance
    return ERC20(_coin).balanceOf(self), 0


@internal
def _burn(_coin: address, _amount: uint256, _eth_amount: uint256):
    initial_balance: uint256 = 0
    min_dy: uint256 = 0

    swap_data: SwapData = self.swap_data[_coin]
    if swap_data.coin == ETH_ADDRESS:
        initial_balance = self.balance
    else:
        initial_balance = ERC20(swap_data.coin).balanceOf(self)
    i: uint256 = swap_data.i
    j: uint256 = swap_data.j

    mul_: uint256 = 10**18
    div_: uint256 = 10**18
    if i > 0:
        if swap_data.is_tricrypto:
            mul_ = TricryptoPool(swap_data.pool).price_oracle(i - 1)
        else:
            mul_ = CryptoPool(swap_data.pool).price_oracle()
    if j > 0:
        if swap_data.is_tricrypto:
            div_ = TricryptoPool(swap_data.pool).price_oracle(j - 1)
        else:
            div_ = CryptoPool(swap_data.pool).price_oracle()
    min_dy = _amount * mul_ * 99 / (div_ * 100)

    if _coin == ETH_ADDRESS or swap_data.coin == ETH_ADDRESS:
        CryptoPoolETH(swap_data.pool).exchange(i, j, _amount, 0, True, value=_eth_amount)
    else:
        CryptoPool(swap_data.pool).exchange(i, j, _amount, 0)

    if swap_data.coin == ETH_ADDRESS:
        assert self.balance - initial_balance >= min_dy * 10 ** (18 - ERC20(_coin).decimals()), "Slippage"
        if swap_data.receiver != empty(address):
            raw_call(swap_data.receiver, b"", value=self.balance)
    else:
        received: uint256 = (ERC20(swap_data.coin).balanceOf(self) - initial_balance)\
            * 10 ** (18 - ERC20(swap_data.coin).decimals())
        if _coin != ETH_ADDRESS:
            min_dy *= 10 ** (18 - ERC20(_coin).decimals())
        assert received >= min_dy, "Slippage"
        if swap_data.receiver != empty(address):
            amount: uint256 = ERC20(swap_data.coin).balanceOf(self)
            response: Bytes[32] = raw_call(
                swap_data.coin,
                _abi_encode(swap_data.receiver, amount, method_id=method_id("transfer(address,uint256)")),
                max_outsize=32,
            )
            if len(response) != 0:
                assert convert(response, bool)


@payable
@external
def burn(_coin: address) -> bool:
    """
    @notice Convert `_coin` by swapping and transfer to another burner
    @param _coin Address of the coin being converted
    @return bool success
    """
    assert not self.is_killed  # dev: is killed

    amount: uint256 = 0
    eth_amount: uint256 = 0

    amount, eth_amount = self._transfer_from(_coin, self.pool_proxy)

    if amount != 0:
        self._burn(_coin, amount, eth_amount)

    return True


@external
def burn_amount(_coin: address, _amount_to_burn: uint256):
    """
    @notice Burn a specific quantity of `_coin`
    @dev Useful when the total amount to burn is so large that it fails from slippage
    @param _coin Address of the coin being converted
    @param _amount_to_burn Amount of the coin to burn
    """
    assert not self.is_killed  # dev: is killed

    amount: uint256 = 0
    eth_amount: uint256 = 0

    pool_proxy: address = self.pool_proxy
    assert PoolProxy(pool_proxy).burners(_coin) == self

    amount, eth_amount = self._transfer_from(_coin, pool_proxy)
    assert amount >= _amount_to_burn, "Insufficient balance"

    self._burn(_coin, _amount_to_burn, min(eth_amount, _amount_to_burn))


@internal
def _set_swap_data(_from: address, _swap_data: SwapData):
    self.swap_data[_from] = _swap_data

    if _from != ETH_ADDRESS:
        response: Bytes[32] = raw_call(
            _from,
            _abi_encode(_swap_data.pool, max_value(uint256), method_id=method_id("approve(address,uint256)")),
            max_outsize=32,
        )
        if len(response) != 0:
            assert convert(response, bool)


@external
def set_swap_data(
    _from: address,
    _pool: address,
    _to: address,
    _receiver: address,
    _i: uint256,
    _j: uint256,
    _is_tricrypto: bool,
) -> bool:
    """
    @notice Set conversion and transfer data for `_from`
    @return bool success
    """
    assert msg.sender in [self.owner, self.emergency_owner]  # dev: only owner

    self._set_swap_data(_from, SwapData({
        pool: _pool,
        coin: _to,
        receiver: _receiver,
        i: _i,
        j: _j,
        is_tricrypto: _is_tricrypto,
    }))

    return True



@external
def set_many_swap_data(_from: DynArray[address, 20], _swap_datas: DynArray[SwapData, 20]):
    assert msg.sender in [self.owner, self.emergency_owner]  # dev: only owner
    assert len(_swap_datas) == len(_from), "Incorrect input"

    i: uint256 = 0
    for data in _swap_datas:
        self._set_swap_data(_from[i], data)
        i += 1


@external
def recover_balance(_coin: address) -> bool:
    """
    @notice Recover ERC20 tokens or Ether from this contract
    @dev Tokens are sent to the recovery address
    @param _coin Token address
    @return bool success
    """
    assert msg.sender in [self.owner, self.emergency_owner]  # dev: only owner

    if _coin == ETH_ADDRESS:
        raw_call(self.recovery, b"", value=self.balance)
    else:
        amount: uint256 = ERC20(_coin).balanceOf(self)
        response: Bytes[32] = raw_call(
            _coin,
            _abi_encode(self.recovery, amount, method_id=method_id("transfer(address,uint256)")),
            max_outsize=32,
        )
        if len(response) != 0:
            assert convert(response, bool)

    return True


@external
def set_recovery(_recovery: address) -> bool:
    """
    @notice Set the token recovery address
    @param _recovery Token recovery address
    @return bool success
    """
    assert msg.sender == self.owner  # dev: only owner
    self.recovery = _recovery

    return True


@external
def set_killed(_is_killed: bool) -> bool:
    """
    @notice Set killed status for this contract
    @dev When killed, the `burn` function cannot be called
    @param _is_killed Killed status
    @return bool success
    """
    assert msg.sender in [self.owner, self.emergency_owner]  # dev: only owner
    self.is_killed = _is_killed

    return True



@external
def commit_transfer_ownership(_future_owner: address) -> bool:
    """
    @notice Commit a transfer of ownership
    @dev Must be accepted by the new owner via `accept_transfer_ownership`
    @param _future_owner New owner address
    @return bool success
    """
    assert msg.sender == self.owner  # dev: only owner
    self.future_owner = _future_owner

    return True


@external
def accept_transfer_ownership() -> bool:
    """
    @notice Accept a transfer of ownership
    @return bool success
    """
    assert msg.sender == self.future_owner  # dev: only owner
    self.owner = msg.sender

    return True


@external
def commit_transfer_emergency_ownership(_future_owner: address) -> bool:
    """
    @notice Commit a transfer of ownership
    @dev Must be accepted by the new owner via `accept_transfer_ownership`
    @param _future_owner New owner address
    @return bool success
    """
    assert msg.sender == self.emergency_owner  # dev: only owner
    self.future_emergency_owner = _future_owner

    return True


@external
def accept_transfer_emergency_ownership() -> bool:
    """
    @notice Accept a transfer of ownership
    @return bool success
    """
    assert msg.sender == self.future_emergency_owner  # dev: only owner
    self.emergency_owner = msg.sender

    return True

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000000000000000000000000ecb456ea5365865ebab8a2661b0c503410e9b347000000000000000000000000ecb456ea5365865ebab8a2661b0c503410e9b34700000000000000000000000071f718d3e4d1449d1502a6a7595eb84ebccb1683000000000000000000000000467947ee34af926cf1dcac093870f613c96b1e0c

-----Decoded View---------------
Arg [0] : _pool_proxy (address): 0xeCb456EA5365865EbAb8a2661B0c503410e9B347
Arg [1] : _recovery (address): 0xeCb456EA5365865EbAb8a2661B0c503410e9B347
Arg [2] : _owner (address): 0x71F718D3e4d1449D1502A6A7595eb84eBcCB1683
Arg [3] : _emergency_owner (address): 0x467947EE34aF926cF1DCac093870f613C96B1E0c

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000ecb456ea5365865ebab8a2661b0c503410e9b347
Arg [1] : 000000000000000000000000ecb456ea5365865ebab8a2661b0c503410e9b347
Arg [2] : 00000000000000000000000071f718d3e4d1449d1502a6a7595eb84ebccb1683
Arg [3] : 000000000000000000000000467947ee34af926cf1dcac093870f613c96b1e0c